Abstract： ASME A18.1:2005 df download.Safety Standard for Platform Lifts and Stairway Chairlifts. 2.82.3 Safety-rope drums, leading sheaves, and their supporting brackets and safety-jaw gibs shall be permitted to be made of cast iron and other metals...

ASME A18.1:2005 df download.Safety Standard for Platform Lifts and Stairway Chairlifts.

2.82.3 Safety-rope drums, leading sheaves, and their supporting brackets and safety-jaw gibs shall be permitted to be made of cast iron and other metals provided such parts have a factor of safety of not less than 10.

2.82.4 Rope used as a connection from the safety to the governor rope, including rope wound on the safety-rope

drum, shall be not less than 3mm (0.125 in.) in diameter and shall be made of a corrosion-resistant metal. The

factor of safety of the rope shall be not less than 5. Tiller-rope construction shall not be used.

2.8.2.5 The factors of safety shall he based upon the maximum stn&ses developed in the parts during the operation of the safety when stopping rated load from governor tripping speed

2.8.2.6 Safety-rope leading-sheave brackets and other safety operating parts shall not be attached to or supported by wood members

2.8.3 Material and Factor of Safety. Governor ropes. where provided, shall be of iron, sicel, monel metal.

phosphor bronze, or stainless steel. They shall be of a regular-lay construction, and not less than 6 mm (0.25

in.) in diameter. The factor of safety of governor ropes shall be not less than 5. Tiller-rope construction shall not be used.

2.8.4 Type A (Instantaneous) Safeties. On th parting of the hoisting ropes (free fall), Type A governor operated

safeties, where provided, shall apply without appreciable delay, and their application shall be independent of the speed action of the governor and of the location of the break in the hoisting ropes (inertia application), and

shall be permitted to be accomplished by the use of a governor and governor rigging having a sufficiently high

value of inertia to apply the safety on free fall independently of the speed action of the governor.

2.8.5 Means of AppLication. Safeties shall be applied mechanically. Electric, hydraulic, or pneumatic devices

shall not be used to apply the safeties required by section 2, nor to hold such safeties in the retracted

position.

2.8.6 Level of Platform Floor on Safety Application. The application of a Type A or Type B safety to stop the

platform, with its rated load centered on each quarter of the floor symmetrically with relation to the center line of the floor, shall not cause the floor to be out of level more than 30 mm/m (0.375 in./ft) in any direction.

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